Embedded Files
The DLR Earth Sensing Imaging Spectrometer (DESIS) is a hyperspectral sensor onboard the International Space Station (ISS). The sensor is operated by Teledyne Brown Engineering (TBE).
DESIS acquires data with 235 spectral bands in the visible through the near infrared (VNIR) wavelength range. The spectral resolution enables precise data acquisition from Earth's surface for applications including fire-detection, change detection, maritime domain awareness, and atmospheric research amongst many others. DESIS has a spatial resolution of 30m, and is delivered in 30km x 30km.
I2R is supporting TBE to validate the image quality and absolute radiometric calibration accuracy of DESIS hyperspectral imagery.
DESIS imagery is commercially available through TBE via their TCloud online ordering system:
DESIS data sets can be ordered at three product levels: L1B (TOA radiance), L1C (orthorectified TOA radiance) and L2A (orthorectified surface reflectance).
The TCloud archive may be searched using the Guest login, but a user account is required to order data.
More information on the TCloud and DESIS data can be found in this online presentation:
DESIS Readers
DESIS Readers
DESIS hyperspectral data is delivered as a multiband tiff file. A metadata xml file is included with every DESIS image that provides information about the acquisition, as well as calibration coefficients that convert the scaled digital numbers in the multiband tiff to units of radiance or reflectance.
I2R has developed code packages that allow users to read DESIS data using either MATLAB or Python. These scripts read the DESIS multiband tiff files and metadata xml files into memory and apply the calibration coefficients to convert the data to radiance (L1B or L1C) or reflectance (L2A).
Each DESIS reader code package includes a README file that defines the software requirements and operation of the scripts.
Additionally, ENVI software may be used to read and convert the DESIS data sets.
*Includes copyrighted material of Teledyne Brown Engineering, Inc., All Rights Reserved.
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